From f2afb214bb47d8411ae2ae1522ffcc9ab88ee052 Mon Sep 17 00:00:00 2001
From: callebtc <93376500+callebtc@users.noreply.github.com>
Date: Wed, 19 Nov 2025 22:06:33 +0100
Subject: [PATCH] turn on fees by default (#831)

---
 .env.example           | 4 ++++
 cashu/core/settings.py | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/.env.example b/.env.example
index 71d032a..bcd942b 100644
--- a/.env.example
+++ b/.env.example
@@ -58,6 +58,10 @@ MINT_DERIVATION_PATH="m/0'/0'/0'"
 # In this example, we have 2 keysets for sat, 1 for msat and 1 for usd
 # MINT_DERIVATION_PATH_LIST=["m/0'/0'/0'", "m/0'/0'/1'", "m/0'/1'/0'", "m/0'/2'/0'"]
 
+# Input fee per 1000 inputs (ppk = per kilo).
+# e.g. for 100 ppk: up to 10 inputs = 1 sat / 1 cent fee, for up to 20 inputs = 2 sat / 2 cent fee
+MINT_INPUT_FEE_PPK=100
+
 # To use SQLite, choose a directory to store the database
 MINT_DATABASE=data/mint
 # To use PostgreSQL, set the connection string
diff --git a/cashu/core/settings.py b/cashu/core/settings.py
index 1b0ed8e..79caa74 100644
--- a/cashu/core/settings.py
+++ b/cashu/core/settings.py
@@ -61,7 +61,7 @@ class MintSettings(CashuSettings):
     mint_test_database: str = Field(default="test_data/test_mint")
     mint_max_secret_length: int = Field(default=1024)
 
-    mint_input_fee_ppk: int = Field(default=0)
+    mint_input_fee_ppk: int = Field(default=100)
     mint_disable_melt_on_error: bool = Field(default=False)
 
     mint_regular_tasks_interval_seconds: int = Field(